"five hikers got lost and one of them left the group and started a signal fire"
In California right now we have over one thousand (1,000)primarily lightning-caused fires burning; the central Sacramento-San Joaquin Valley have been filled with unhealthy levels of particulate matter from smoke for days. So, starting a fire is not too popular around here.
In California, anyone found guilty of intentionally starting a fire like the one in AZ could be subject to civil fines and various criminal charges, but only after an investigation established the facts.
I agree with all the sentiments expressed so far, but also caution that we should not rush to a final judgment. Let's learn what all the facts are so we can learn whatever real lessons are presented beyond just the headlines of this story.
How about learning and then teaching fire safety, along with restoring the fire area, as community service?